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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a34cd2036f0159965a3ceb225f93e8c12f8a700e1c4c78977501aaf1974ccce8' 
  AND token = 'hBBDO+RzpDcILOWMP29hFrBPStsdo0vvM8ErUoS3TM0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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