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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b31d0b4d1160294a7988248daa1c18db9ac59d454ec7f5450954bb70771da2c7' 
  AND token = '3VrwRETP1iG+z0XLKnlx6Fb3mmMa4ANPtD2hOvm3idQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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