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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '692b93a4cc5854cce6501751637bd4a2598c7eb13e831df10b62568b093241c0' 
  AND token = 'KSp4JfGMNckqwzxxy9Wjm7oU0dzN66jtibOODUseoCM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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