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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '95e6b5eaec0c854963c76380e6c179c5d0f18ab94992465b7982519cf32f9515' 
  AND token = 'yyBstdM5+MvVDizSB7wx00VI+jGXZlG5ce8kY/RSHFA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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