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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9c6f43c3e73b3442e9f88c43212f934387d7c087d4decbe117b33085c1ea9b32' 
  AND token = 'SmTBAJZpZFYJ5m6oKDdCtDdwxIEOjMPUBghT8QtInyM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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