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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '01750c20eb63be4959aa5e7fb987e6b8925eb7dd4c4e97ff63436f2a008b0ca5' 
  AND token = 'XHe4eUK8JtPQnezo3sERplzi4z4DGEfIlZ62XgoWNXA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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