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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7a9a3a5dd733f0d4cde579240e3623eacef0a45328d1774540ad8620d028291e' 
  AND token = 'WYmLKHPQOUMtToUJucA4jG7zHYI0HaqgNlAFABY6oKg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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