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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8c61bb15478b7a337dd9b00c5ea64e1f59042a1e83de266e8ae4dac61eb041ff' 
  AND token = 'DUC+BCNFpJh7hbrKFQImMawPHXDFYISvnx0T7pdi/fs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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