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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3577f88e8e4015da4eb2257440b5738c95efc4a909c7e5fe9751324ec2c51cf9' 
  AND token = '87+5SCmoSfMhyVeUkpCPv1vwKRdVc0jM10cr/nkJS2o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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