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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '356395bc5d9c87f9d3471960b7ddcb9b56364926a593fa486a5044a9538747d9' 
  AND token = 'HpAxsBjaXvyykFJ3skW9U1yfatd1U6A1dV00WkaBeZA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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