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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cde290a384bc259719ad0ecea29228e74493f7f0277db83084f38babb4ffc5fc' 
  AND token = 'xDCi1ClrDgXd5TWoYxqewsPYfsljYu/vE7yOwSY/5Qs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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