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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0456289f680ec1e5bb2a5214cc9877c7ff5432652dcc0dff25edd1e0d982391e' 
  AND token = 'kavTj8nz6yxHR+QGWWVEcLmzuXP482E6b9sRyXPttmg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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