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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7d8c6b027bc0574eb15883f36ca63a7b1e9eb10cf4bf119f94745c9a4237ed02' 
  AND token = 'vv6gX//CkZtMOSBAHB9al6nb4Ay0xJsR9QdMf4Hk+Jw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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