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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '287bf9367f1d2d8e8ea518953641a0ae1b7a68dbb78581461724975af4e638b5' 
  AND token = 'KOtP8gKqfHKhkdi4PngUnw8ej2N+6fyBW53KYW0TvmI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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