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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2e0232963eebf194ac12fb2eff4d25a80495a7c52e05ccb58804836e5cfc65e5' 
  AND token = '1jaiykFnhV36+dTfuUDpj3C55wKxKLKc1joClNClTY8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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