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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '59235a84bb98b4ae9d59ca278fb3ae1ed0b239dbb79d1dfc712edbd293e1777b' 
  AND token = 'Zt9SWhz0ACLkSDTlvRwvIiFlvBruWM8685vTs6sqVo0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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