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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd431244e574cc5c5e3ba17ea4c44987786d7f0af878a4983dd5adb71a28e53c7' 
  AND token = 'XlxXBbHa3vPoqdIagj++ny3UtbfYJuGXfWdzQEYATeE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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