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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a56cead04afc8d9295971aa8fd42f9a04934dc4a5c948aef5bcc27e980930cd8' 
  AND token = 'wp54OicQ4TLnhey7TTMawJsLucEeGbxTYe2NVZ3zkPY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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