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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '92b4cb3b3478eef1da41f2f89d61a97e3ea79c0aaf6ffaf733af37c4fd48a4eb' 
  AND token = 'YzxMZsaZNUogqPjJXE3AdelIwvFavbhNoZ0/lNNS3EM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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