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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '17f9af0ae97b8764ae0f3df2d587841fa9b0dbee948634eb5d81ec966e6f126e' 
  AND token = '1q6Bozz2cFxR7EKb3AdBjJTcAtuBAlbe3Qdl1Lbzasc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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