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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3d6b32251caff68723fef02977a853b43f6c97c8305c81391eba16cb091d1601' 
  AND token = 'tjB3ehyyVlsrDvAJLVCD578riWEuDi2d13IsgETLP+A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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