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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a96294af9b22fc28b1bacb45f6c2ca964a96ee4cd487a59c4c3ba508363ee8c1' 
  AND token = 'v7GbZVU5GURC0M+woOnMXO3LciB7VwJ9IHmIM116+JQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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