SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eb5e2f9ac633702f1ccb92625d04653cfe63206bc550f6f7a8410b65a7216e82' 
  AND token = 'wluNLV0U/jHBsuagptIgvUM3HHGG8SCjY/gsg+bsnAo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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