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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ab11ecac08c8a8d60587723a768c443875c0a77473a7522d0c28f25779471759' 
  AND token = 'KnkQd8Pw7Vanr5xBEib5G0JTZF7bYZLHdr7F/Jp04G4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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