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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b38354841b1d9eca906d9ae4c77211064cc15c49aa38e8d534d8dcde976f0f0b' 
  AND token = 'hy8jfbIlNZtKIzxJBicWtVWO7xS/LbnbYMQpAv/myZ8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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