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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '49c5c9c83d6eff77b616cba6c99dff3ca679c25cdcdbb13c5598793fbdc33331' 
  AND token = 'tQiY2YhT3IpTmhwOqZPNguT9WXrmt0yS6cUbMCVGFTA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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