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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9c78a36977dc4d8c933a2e348935fba191a3f2af6104ebcd584eb26036cf96b0' 
  AND token = '0I7xk9PaNqeF6k3kPd2YCd4tUwB2evNzwpnbgraAxq0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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