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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd8040e2ec75b9711214ca7a87616b8d0133f8fa05e729a76335368d249f73e85' 
  AND token = 'jA/Mqiv1CFaTbMmHia1BaNStobHwUZFYz3C9Ez0Pyew=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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