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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fd67bac821d8f7c7cff78aec7abffa1aca6e20664e48416476b1460c27f032d6' 
  AND token = 'Y5Kj0FR29Rb+EG2FVwvESVIvWm9CAKzeKEX/KuHfhQo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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