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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'caa67dc1e3f30c4d0ee0bff70053f00f7042a417c5794e47eab6aef661a3da7a' 
  AND token = 'wlMDNF8h7fqbXQM2Vzf7b3jdzkoiGZooWcG/BpBIBNU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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