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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dbaefaffa9de11503ba160b82819e0f82e92243f1d22eda9b8d93dc1b95f6bda' 
  AND token = 'CkVCnv51RxOU+XxikHYknW85Tl5T3kyRQzble3Jx7As=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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