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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5e9e9e9aaf9b480a10ea9cca7516e13fde8bbb43e5db784f335c168c4c3dc414' 
  AND token = 'g8/THNJtxG4+G0jhZp/kFDgS4uNvoy9BssGhY94I6tM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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