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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '06a15829981c56cc32c854200e21c885bc24465b5ea4efc8c4b428cb39c5fef0' 
  AND token = 'ecY2Mqgu3rqyW28Hhi4r1EBVNsg3XJZxp99lGrn6a5c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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