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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '71ccc24cc4030596cfcbd6ea681317db6cd6f56e0d630f2f09c95f5fecd0e4b7' 
  AND token = 'jmKhDbGJ3b688cl5QaB4ze3CQT0N5aha7TPz8tUY3F4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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