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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7012fb42fc44cdc197ccb827405bad3acac4d3f524d9a4145eefa9fe074a3f4b' 
  AND token = 'COzMGsZzrmQeEK9406gNy4ufrwHyoK1IsCM4I70fIMs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}