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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '27b56e0d66d6581992816fbb97ca5c50166a967fdf3c787d97e8eb09fc9acd63' 
  AND token = 'zzcdyiZNASootoadLKRV4sJsE6BN4A7Ksf7lkJn3UMk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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