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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3af1b819dbf04d8e2d1a888094e09a4d300873afec0e36973519276ce28fa6ce' 
  AND token = 'DG91u7QagatqagV1mbNHMbuS0R/92BM8G2UyC3bz5P0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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