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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6610a38d83813e5f165e7b4c348c698118dcdcca5c18f30441eb66b983ab18c5' 
  AND token = 'KwTRChAQ+2o9Gzg/+RlpK0nuFn0WXA2XE1COt49ejho=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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