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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a200e9214cf99df95d97fef7ce79132502e1a6a1fc842c03a224fbc28f4ec69f' 
  AND token = 'rxnjYrlyVp0xhfk0SxrkYXVi0jJBd6u/en0H3MBhRFM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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