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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'da951257036842b633d283f2636672a56dd9acb15d162676e2bd37206c93b13a' 
  AND token = 'm+BwIknt9APJUmh/eFPHnlzUU2q4OfWZ+A+mClfdf2U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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