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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '71bd1fb2c8a829699dae451eee3cac684cd513aa1ab472f17f2e86373cdfc1dd' 
  AND token = 'ixtqnve9JncgVdM5iWR2a6+MnelPfDp3OhTrz+O5Ukg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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