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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f6fc4fd92f63f780e685e3592711d38d78955e793740eeea3f929d43bba67983' 
  AND token = 'b2iDYY5Bri2kTQko5JvoBbjWf9w32JbkvHlzgYWKB5A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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