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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7ddb674cc3654f2a2b8219eb0be750943f7a2c749edea4fd26ecd9ca403fa87a' 
  AND token = 'agsTcc818j2p5IjVALanR+Uqy21VuTnGzoEh7WMcUPk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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