SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0c9093a9e5886ed1b4e47be7180ecf232ef5b3658e45e603843f2f24e45b1f11' 
  AND token = 'nxgN/7qYUxKfC1CcCQVXyGGybHW6gfOJ+Qc/LwAiGpY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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