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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e27a7b7bad9abbbd6c6e8a5ab646ed2f96b6d37a3aa379c0b3bf6d64ee918439' 
  AND token = 'bAEENJl5Xy0UZp8oDbcR/tF+fsz4HzwmcmcKcTaUJHU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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