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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '005be342783f4ffd34e6037a602ed9d058e14c94617d6ff475f498213d0c3887' 
  AND token = 'V8UPIsYfecfXR29H2k/wyTrNQ7pdFQ0adr7TZ+l7oB8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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