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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '25bffe97d1baec1697988db72528a2c3f84d33feffc3ebdf92696719d32e610e' 
  AND token = 'Dhn/4mOAiJhx9N6W+IPKYT3j6Jc+f6yFF/cl/9UGvfI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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