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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '411ba1dccd601ec021ec7ddb21c7a32690be815ef8b20186623fdc7032be4294' 
  AND token = 'REFNtqHn5lSFCMrTgnWaCPgbWKdpo+X6xFzYTDtIuc4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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