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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fc2b579cfdafb839062f8108b544c578382c323a7f262e9e62847eb32f4c125e' 
  AND token = 'NLIe/5LJPWjZ7SBXXdvASHM6v5Z5FeHoeiVVK6PMZkU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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