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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b5cb4ca13fa2d5f0b5444943bf0c101f05814d502c2713bf6b89ef9ab24ecb77' 
  AND token = 'JWC4Id3Cl+EnqpUGH7vw7QHgs2IglSAtuMoP6vLFoSM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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