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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a319ed2e730efe87f2b6dc11243e2ec398b8b1201b54ca07c40af79a8d4dca41' 
  AND token = 'shRea+ddCcVTRMrTa+Kow4cdLilYkWht1o0dwdr9TVI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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