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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '31e004c367a2d23e01cc1fd51aaa618467d7edbbc36973af120a044a2d38503b' 
  AND token = '1XFs5fLZoiMVHoIB3uzJEh/Qpo2LlG+2dnM9/o0IgNE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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