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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0fb42592c0c4abb33a71dd9baae0210fd8419f3fdd3b390ecb33ffc38b97e7c5' 
  AND token = 'Jx3P6N6FuGMgLovyBHFRMjaKv1REMdQr6hmaLztV5w4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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